Tail-stock spindle for lathes



mm Q A. WEBSTER. TAIL STOCK SPINDLE FOR LATHES'. 4

Patnted ont. 8,1889.

(No Model.)

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*PATENT OFFICE- AMBROSE WEBSTER, OF WALTHAM, MASSACHUSETTS.

TAIL-STOCK lSPINDLE FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 412,439, dated October 8, 1889 Application tiled June 2l, 1889. -Serial No. 315,101. No model.)

To @ZZ-whom it may concern:

y Be it known that I, AMBRosE WEBSTER, a citizen of the United States of America, and aresident of the city of Waltham, in t-he county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Tail-Stocks for Lathes, of which the following is a full, clear, and vexact description.

This invention in tail-stocks of lathes relatesto clamping the spindle in a bushing or quill otherwise adapted to be held in the tailstock, and to holding the bushing against 'backward movement through the tail-stock as the spindle is moved forward through the bushing.

The invention consists,flrst, of abushing or quill adapted to receive the spindle and to be held in the tail-stock, and having through its thickness two transverse cuts or slits eX- tending partially around it, and a longitudinal out or slit crossing its said transverse slits and extending partially along its length, in combination with a screw-pin crossing the longitudinal slit. between the transverse slits, and engaged with the walls of the longitudinal slit, so that turned in one direction it operates to close and thereby to clamp the bushing on, and in the other direction to release the bushing from, the spindle.

The invention consists, second, of a bushing or quill adapted to receive and to be clamped on the spindle, and to be inserted in the tail-stock, and constructed with a shoulder torest against the tail-stock, and thereby, as the spindle is forced forward through the bushing, to secure the bushing against moving backward through the tail-stock.

In the drawings forming part of this speciiication, Figure 1 is a central vertical longitudinal section of the upper part of, and a side elevation of the lower part of, a tail-stock having theimprovements of this invention. Fig. 2 is a transverse vertical section, line 2 2, Fig. 1. Fig. 3 is a central horizontal section, line 3 3, Fig. 1, but without the operating mechanism for a movement of the spindle forward and backward through the bushing. Fig. 4 is a side view of the slit bushing or quill of Fig. 2, detached. l 1

In the drawings, A is the tail-stock, at its lower portion A2adapted, as usual, for application to the lathe-bed. The upper portion A3 of tail-stock is bored out from end to end to receive a bushing or quill B, which in turn receives the spindle C, having a prick-point D secured therein. In Fig. 1 the bushingB is in one length and in Figli it is in two lengths, placed end to end. In both instances the bushing projects beyond the front and rear ends of the tail-stock, and its front projecting portion B2 has a surrounding shoulder or bead B3, to rest or abut .against the front end of the tail-stock, and, again, it has two transverse cuts or slits B4 B4- through its thickness, one at each side of its said shoulder and partially around it, and a longitudinal slit B5, crossing its said shoulder and its said transverse slits and extending fora portion of its length.

E is a screw-pin extending longitudinally across from wall B to wall B7 of the longitudinal slit B5 of the bushing. This screwpin E at one end portion E2 engages one wall BG, and at its other end portion E3 passes loosely through the other wall B7 of the longitudinal slit B5 of the bushing, and it has a shoulder E4 to abut against the wall B7, and also a handle E5 for convenience in turningit.

Turning the screw-pin E ,in one direction forces the opposite side walls BG Blof the longitudinal slit or cut B toward, and turning it in the other direction leaves said walls` free to open from, each other--in the first instance clamping the bushing on, and in the second instance releasing the bushing from, the spindle. A clamping of the bushing on the spindie, as described, preserves the true axial line of the spindle.

As shown, Fig. 1, the spindle is adapted to be moved forward and backward by turning a feed-screw F in the proper direction, all as well known and as usual, and in this case the shoulder BB of the bushing in its abutment against the front end of the tail-stock holds the bushing against moving backward as the spindle is forced forward byturningthe feedscrew F.

As the mechanism of Fig. 1 is all contained in the bushing or quill B, obviously it can be fitted and made complete of itself, all without handling the tail-stock.

Having thus described my invention, what I IOO claim, and desire to secure by Letters Patent,

a shoulder B3, in combination-With the tailstock of the lathe adapted to receive said bushing and to make arest forits said shoul- 15 der B3, substantially as described, for the pur-L pose specilied.

In testimony whereof I have hereunto set my hand in the presence of two subscribing wit- IleSSeS.

AMBROSE WEBSTER. NVitnesses:

ALBERT W. BROWN, W. O. SHAW. 

